Machine for upsetting bolts and similar articles

ABSTRACT

The present invention relates to a machine for upsetting bolts and similar articles comprising dies fixed in the frame of the machine, a carriage reciprocable with regard to said dies, holding means for holding punches attached to said carriage, said punches being engageable with said dies by means of said reciprocable carriage, and pins which can be shifted in said frame and positioned coaxially with said dies, for ejecting the upset articles from said dies. Because of the oscillation of the shaft and the action of the ejecting levers by means of cams it is impossible to drive such a machine with an elevated number of revolutions since the moving masses are considerable. Furthermore, in such a machine it has been unusual up to now to apply a separate ejecting lever for each processing station. Said ejecting levers receive their oscillation movement from an oscillation shaft, an ejecting cam being provided for each lever said cams being subjected to a cumbrous and time-consuming adjustment or must be replaced when the ejecting length must be changed.

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tates 5 let Van De Meerendonk MACHINE FOR UPSETTING BOLTS AND SIMHLAR ARTICLES Inventor: Gerardus C. Van De Meerendonk,

l-lelmond, Netherlands Assignee: Nedschroef Octrooi Maatschappii N.V., Helmond, Netherlands Filed: July 8, 1970 Appl. No.: 53,092

us. or. ..10/12 R, 10/76 R, 72/427 Int. Cl. ..B21k 1/44, B21k 1/58, B23g 9/00, B21 j 5/08 Field or Search ..10/12, 12.5, 12 T, 11,72, 10/72 T, 76, 76 T; 72/427 References Cited- UNITED STATES PATENTS 12/1932 Burbank ..10/12 T 6/1934 Wilcox ..10/12 T 9/1937 Purtell ..10/12.5 3/1938 Gaess ..lO/l2.5

l 1/1964 Carlson ..10/12 4/1969 Byam etal ..10/12 3/ 1965 Maistros 10/1 2 FOREIGN PATENTS OR APPLICATIONS ll/l964 Great Britain ..10/12 Sept. 5, 1972 Primary ExaminerRichard J. Herbst Assistant Examiner-E. M. Combs Att0meyPennie, Edmonds, Morton, Taylor and Adams [5 7] ABSTRACT The present invention relates to a machine for upsetting bolts and similar articles comprising dies fixed in the frame of the machine, a carriage reciprocable with regard to said dies, holding means for holding punches attached to said carriage, said punches being engageable with said dies by means of said reciprocable carriage, and pins which can be shifted in said frame and positioned coaxially with said dies, for ejecting the upset articles from said dies.

Because of the oscillation of the shaft and the action of the ejecting levers by means of cams it is impossible to drive such a machine with an elevated number of revolutions since the moving masses are considerable.

Furthermore, in such a machine it has been unusual up to now to apply a separate ejecting lever for each processing station. Said ejecting levers receive their oscillation movement from an oscillation shaft, an ejecting cam being provided for each lever said cams being subjected to a cumbrous and time-consuming adjustment or must be replaced when the ejecting length must be changed.

10 Claims, 5 Drawing Figures P'ATE'NTEDSEP 5 m2 SHEET 1 OF 5 INVENTOR wudLmu/Lnmdmu 724324 nil...

A TORNEYS WENTESE? 5 1972 SHEET 3 OF 5 MA RNEYS MACHINE FOR UPSETTING BOLTS AND SIMILAR ARTICLES The present invention relates to a machine for upsetting workpieces to form bolts or bolt blanks and similar articles comprising dies fixed in the frame of the machine, a carriage reciprocable with regard to said dies, holding means for holding punches attached to said carriage, said punches being engageable with said dies by means of said reciprocable carriage, and pins or rods which can be shifted in said frame and positioned coaxially with said dies, for ejecting the upset workpieces from said dies.

Because of the oscillation of the rocker shaft of prior art machines and the action of the ejecting levers by means of cams it is impossible to drive such a machine with an increased number of revolutions since the moving masses are considerable.

Furthermore in such a machine it has been usual up to now to apply a separate ejecting lever for each processing station. Said ejecting levers receive their oscillation movement from an oscillation shaft, an ejecting cam being provided for each lever said cams being subjected to a cumbrous and time-consuming adjustment or must be replaced when the ejecting length must be changed.

In order to avoid said disadvantages in the machine according to the invention substantially all ejecting pins are driven by a common ejecting lever, which is oscillated by means of a continuously rotating crank, said ejecting pins being connected to said lever by means of connecting rods being adjustable for changing the stroke lengths.

When articles such as hexagonal headed bolts are to be upset which are to subjected to a stripping off treatment, said stripping off action to be carried out in the last station, the ejection must not take place gradually, however, must take place with a short, quick stroke in order to cut off the material during the stripping off action.

For that purpose in the machine according to the invention the means for actuating one or two ejecting pins are detachably connected to the ejecting lever and they are adapted to be driven separately in such a way that a short, quick stripping off stroke can be carried out.

In the drawing an embodiment of the machine according to the invention is shown by way of example.

FIG. 1 shows an elevation of the machine according to the invention.

FIG. 2 shows a vertical section of a portion of the machine on an enlarged scale along the line IlII in FIG. 3.

FIG. 3 shows a plan or view of a portion of the machine on an enlarged scale.

FIG. 4 shows a vertical section of an arrangement for effecting a stripping off action along the line IVIV in FIG. 3.

FIG. 5 shows a back elevation of the machine on an enlarged scale, in which an ejector means for a stripping off station is driven individually.

In the drawing an upsetting machine is shown comprising an electric motor 2, driving a flywheel 4 by means of V-belts 3. Said flywheel 4 is mounted on a crankshaft 5 supported by bearings in the frame 6 of the machine 1. Said crankshaft 5 transmits through the connecting rod 7 a reciprocating movement to the carriage 8 (vide FIGS. 1 and 2).

Punch holding means 9 containing punches are mounted on said carriage 8. Said punches cooperate with the dies 10 in the tool holding means 1 1.

The various punches and dies together form the various processing stations in which the workpiecesare subjected in succession to an upsetting operation. A transport device (not shown) carries the workpieces from the one station to the following station. After being subjected to an upsetting operation the workpieces must be ejected from the dies 10, by a mechanism to be described hereafter.

A gear 12 is provided on the crank shaft 5, said gear 12 driving the gear 15 through the gears 13 and 14.

Said gear 15 is mounted on a crank shaft 16 supported in the frame 6. Said crank shaft 16 which continuously rotates, provides through the connecting rod 17 the ejecting lever 18 with an oscillation about the shaft 19 attached to the frame 6.

The ejecting lever 18 is a two armed lever which can oscillate about the fixed shaft 19, one arm 20 of said two armed lever being connected with the connecting rod 17. The arm 20 comprises two, parts 21 and 22, which are immovably interconnected by a pin 23a and a bolt 23b. The upper arm 24 of the ejecting lever 18, as shown in FIGS. 3 and 5, has elongated slots 25, 26, 27 and 28 respectively and individually for each processing station, and clamping bolts 29, 30, 31 and 32 can be set tight by means of respective nuts 33, 34, 35 and 36. Connecting links 37, 38, 39 and 40 are pivotably attached to said clamping bolts 29-32. Said links 37-40 are pivotably connected with said clamping bolts 29-32, and also respectively pivotably connected with ejecting pins 41, 42, 43 and 44.

In this way the ejecting pins 41-44 receive by the oscillation of the ejecting lever 18 a reciprocating movement and will remove during the reciprocation the articles (not shown) from the various dies 10 through the ejecting pins 46 (FIG. 2), which are under the action of springs 45, and the pins 47 (FIG. 4) to be changed with the tools.

It will be clear that the ejecting length is determined by the position of the clamping bolts 29-32 in the slots 25-28 of the ejecting lever 18. If said bolts are fixed in a higher position the stroke of the ejecting pins 41-44 will be longer. Since for each processing station the separate slots 25-28 are provided in the ejecting lever 18, it is also possible to determine the ejecting stroke length for each station.

Additionally the position of the ejecting pins 41-44 can be adjusted by means of the turnbuckle bushes 48-51 having left hand and right hand screw threads.

The above mentioned does not always apply to the last processing station. When articles are made which must be stripped off, as e.g., hexagonal bolts, and whereby the stripping off operation must take place at the last station the ejecting movement must not take place gradually, but with a short quick stroke in order to cut off the material during the stripping off operation.

In order to bring about said short quick stroke the crank shaft 16 (vide FIG. 4) is provided with a socalled stripping off cam 52, on which rotates a cam roller 53 attached to the ejection lever arm 24, said arm 24 being pivotably arranged on the pivot 19 and being adapted to make an oscillating movement by means of the cam 52 under the action of a draw-spring S4. A slot 28 is provided in the ejection lever 24 said slot having the same connecting means as the ejecting pin 44. The ejecting pin 55 served by the ejecting lever arm 24 through the pin 47 urged by a spring pushes the article through and out of the stripping off die. The part 57 with the cam roller 53 is attached to the ejecting lever arm 24 by means of screws 56.

The cam 52 is shaped in such a way that the short, quick stroke received by the ejecting pin 55, is suitable to strip off all articles to be made on the machine.

When upsetting articles which do not need to be stripped off, such as e.g., cylinder head-screws, the part 57 with the roller 53 is removed by loosening the bolts 56 and the arm 24 is coupled to the ejecting lever 18 by means of the wedge member 58 (vide FIGS. 2 and 3) and the bolts 59. Then an ejecting lever is created again for all ejecting pins 47 applicable for all purposes.

The advantages of the machine described are among others the following:

i. No replacement or adjustment of ejecting cams which mostly are ill accessible.

2. Very simple adjustment of the ejecting stroke length by displacing one clamping bolt only in the ejecting lever after loosening exclusively one nut.

3. By the application of a crank shaft and the interconnection of various parts a forced movement is created such that an increased number of revolutions of the machine is possible without the possibility of the so-called lagging behind of moving parts detached from each other.

4. One ejecting lever for different processing stations, whereas one ejecting lever is created for all other stations by means of the possibility of interconnecting the ejecting lever of the last station with the lever of the other stations.

lclaim:

1. An ejector mechanism for a machine of the type used for upsetting workpieces at a series of forming stations for the production of bolt blanks and the like, said machine including a frame having a series of dies arranged therein respectively at the series of stations for receiving workpieces, a reciprocal carriage mounted in the frame for carrying a series of punches adapted to respectively cooperate with said series of dies, and said ejector mechanism comprising an ejector rod guided in the frame of the machine coaxially with each die for removing upset workpieces from the series of dies, an ejector lever pivotally mounted on a shaft on the frame of the machine for simultaneously actuating the ejector rods associated with the series of dies, said lever having a curved arcuately shaped structure extending from the shaft and facing toward the outer ends of the ejector rods, said curved arcuate portion of the ejector lever portion of the connectin means at a selected position along said curved slot or varying the length of the stroke given to the ejector rod, and means for rocking the ejector lever on said shaft to swing it toward and away from the position of the ejector rods, to in turn actuate the ejector rods associated with the ejector lever.

2. A machine as claimed in claim 1, wherein the concave side of the ejector lever faces toward the outer ends of the ejector rods.

3. A machine as claimed in claim 1, wherein said ejector lever includes a separable portion for actuating the ejector rod for one of said stations, and means for applying a quick stripping-off stroke to said portion of said lever when separated.

4. A machine as claimed in claim 3, wherein said stroke-applying means comprises a rotatable shaft, a cam on said shaft, and an arm on said lever portion having a follower engaging said cam.

5. A machine as claimed in claim 3, wherein said ejector lever portion actuates the ejector rod in the last station of the series, and means for releasably securing said lever portion to the remainder of the ejector lever.

6. A machine as claimed in claim 1, wherein the means for rocking the ejector lever comprises a continuously rotatable crank shaft, :1 connecting rod actuated by the crank shaft, and an arm on the ejector lever pivoted directly to the connecting rod.

7. A machine as claimed in claim 1, wherein the connecting means between each rod and the ejector lever comprises spaced pivot connections respectively with the ejector rod and adjacent the ejector lever, and linkage means between said pivot connections for adjusting the length of the connecting means and the stroke length of the ejector rod.

8. A machine as claimed in claim 7, wherein the linkage means is a turnbuckle.

9. A machine as claimed in claim 1, comprising an end station for stripping-off the formed blank including a die, an ejector rod therefor, a separate ejector lever mounted on said shaft and having an adjustable connection with the ejector rod, and means for applying a quick stripping-off stroke to said separate ejector lever.

10. A machine as claimed in claim 9, wherein said stroke-applying means comprises a rotatable shaft, a cam on said shaft, and an arm on said separate lever having a follower engaging said cam. 

1. An ejector mechanism for a machine of the type used for upsetting workpieces at a series of forming stations for the production of bolt blanks and the like, said machine including a frame having a series of dies arranged therein respectively at the series of stations for receiving workpieces, a reciprocal carriage mounted in the frame for carrying a series of punches adapted to respectively cooperate with said series of dies, and said ejector mechanism comprising an ejector rod guided in the frame of the machine coaxially with each die for removing upset workpieces from the series of dies, an ejector lever pivotally mounted on a shaft on the frame of the machine for simultaneously actuating the ejector rods associated with the series of dies, said lever having a curved arcuately shaped structure extending from the shaft and facing toward the outer ends of the ejector rods, said curved arcuate portion of the ejector lever being provided with a series of parallel elongated spaced slots respectively opposite the outer ends of the ejector rods and extending in a direction away from said shaft, a connecting means attached to the outer end of each ejector rod and extending therefrom and having a projecting end portion extending through the corresponding curved slot in the arcuate curved portion of the ejector lever, means for securing said end portion of the connecting means at a selected position along said curved slot for varying the length of the stroke given to the ejector rod, and means for rocking the ejector lever on said shaft to swing it toward and away from the position of the ejector rods, to in turn actuate the ejector rods associated with the ejector lever.
 2. A machine as claimed in claim 1, wherein the concave side of the ejector lever faces toward the outer ends of the ejector rods.
 3. A machine as claimed in claim 1, wherein said ejector lever includes a separable portion for actuating the ejector rod for one of said stations, and means for applying a quick stripping-off stroke to said portion of said lever when separated.
 4. A machine as claimed in claim 3, wherein said stroke-applying means comprises a rotatable shaft, a cam on said shaft, and an arm on said lever portion having a follower engaging said cam.
 5. A machine as claimed in claim 3, wherein said ejector lever portion actuates the ejector rod in the last station of the series, and means for releasably securing said lever portion to the remainder of the ejector lever.
 6. A machine as claimed in claim 1, wherein the means for rocking the ejector lever comprises a continuously rotatable crank shaft, a connecting rod actuated by the crank shaft, and an arm on the ejector lever pivoted directly to the connecting rod.
 7. A machine as claimed in claim 1, wherein the connecting means between each rod and the ejector lever comprises spaced pivot connections respectively with the ejector rod and adjacent the ejector lever, and linkage means between said pivot connections for adjusting the length of the connecting means and the stroke length of the ejector rod.
 8. A machine as claimed in claim 7, wherein the linkage means is a turnbuckle.
 9. A machine as claimed in claim 1, comprising an end station for stripping-off the formed blank including a die, an ejector rod therefor, a separate ejector lever mounted on said shaft and having an adjustable connection with the ejector rod, and means for applying a quick stripping-off stroke to said separate ejector lever.
 10. A machine as claimed in claim 9, wherein said stroke-applying means comprises a rotatable shaft, a cam on said shaft, and an arm on said separate lever having a follower engaging said cam. 